Electric selector mechanism



Dec. 2, 1930. H. L. KRUM ELECTRIC SELECTOR MECHANISM Original Filed July 16. 1926 4 Sheets-sheet 1 Uw: a/wll, 70mm Dec. 2, 1930. H. i.. KRUM 1,783,382

ELECTIC SELECTOR MECHANI SM Original Filed July l, 1926 4 Sheets-Sheet 2 DerN 2, 1930- -H. L.' RUM 1,783,382

ELECTRIC SELECTOR MECHANISM Original Filed July 16,- 1926 4 Sheets-Sheet 3 Dec. 2, 1930. H. L. KRUM ELECTRIC SELECTOR MECHANISK Original Filed July 16. 1926 4 Sheets-Sheet 4 Patented Dec. 2i, 1.93()

D STATES HOWARD L. KRUM, OF CHICAGO, ILLINOIS, ASSIGNOR TO TELETYPE CORPORATION, 0F CHICAGO, ILLINOIS, A CORPORATION OF DELAWARE ELECTRIC SELECTOR MECHANISM Application filed July 16, 1926, Serial The invention relates to electric selector mechanisms such as are employed forelfecting the operation of telegraph receivers, printers or the like, and which comprises a set of selectors adapted to be positioned or conditioned in different combinations in response to code signals comprising permutations of two different electrical conditions extending through a definite number of successive time intervals. More particularly the invention relates to a selector mechanism in which the selectors are mechanically set under the joint control of a locally driven member, usually a rotating shaft, and a member or armature that is selectively vibrated by a magnet in response to the received code combinations of electrical conditions. In such mechanisms, the setting of the selectors is controlled or determined by the vibratory movement of the magnet armature or of a member vibrated thereby, and the setting operations are timed by the locally driven member in synclironism with the intervals 'of each of the received signals. Such selector mechanisms, because of the absence of contacts, are more durable and possess many advanover those employing electrical distributors or sunflowers, and give good satisfaction, particularly in start-stop systems in Which the locally actuated member' is arrestcd at the end of each signal period and is initiated in operation by a starting electrical condition which precedes the selecting intervals of each signal. But usually such single magnet, mechanical selector mechanisms do not have as great a margin of operation as those employing an electrical distributor; that is to say, they either cannot be operated at such a high rate of speed or else they permit of lless variation in the relative speeds 'of the transmitting and receiving distributors, and the speed, orientation, and other adjustments must be made more carefully and more frequently. This is because it is difficult to so construct a mechanical selector mechanism, particularly if the parts are of light Weight to permit of high speed operation, that the setting of the selectors will be determined at definite points or at very brief, spaced intervals during the cycle of operation No. 122,808. Renewed June 20, 1929.

of the locally actuated member, and which points are uniformly spaced or timed to permit them to register With the mid-portions or most effective portions of the intervals of the received signals. This is particularly true Where the mechanical setting of the selectors is eected or timed by a cam or a spiral series of cams that are continuously rotated during each signal interval or selecting cycle, and in Which the construction is such that, as is desirable, the selector controlling vibratory member is yof light Weight and vibrates through a slight angle.

In accordance With the present invention, a locking device, preferably of the knife-edge type, is operated in exact synchronism With the locally driven member and is arranged to engage the magnet armature or the member vibrated thereby at definite spaced points in the cycle of operation of the selector and slightly in advance of those portions of the cycle in which the setting of the selectors is effected, so that the setting of the selectors is predetermined at such uniformly spaced points and also so that the controlling member is held against vibratory movement during the actual setting of the selectors. The present improvement is capable of Wide modifications and is applicable to many types of single magnet mechanical selecting mechanisms, but is particularly applicable to the selector mechanisms sliovvn in the prior applications for patent filed in the United States Patent Ol'hce by Sterling Morton and Howard L. Krum, Serial No. 757,661, filed December 23, 1924, and E. E. Kleinschmidt, Serial No. 704,022, filed April 3, 1924. When the present improvement is applied to these prior selector mechanisms, Which are otherwise Well adapted for high speed, accurate operation, as great a margin of operation can be obtained as With the far less durable electric distributor type of selecting mechanism.

The present invention also provides an improved start-stop mechanism for the rotary distributor. The preferred forms of the present invention are illustrated in the accompanying drawings and more fully set forth hereinafter in detail, and the scope of the CLI invention is defined in the appended claims.

In the drawings:

Fig. 1 is a plan view of a selector mechanism of the type shown in the prior Morton and Krum application, Serial No. 757,661, to which the present improvements are applied.

Fig. 2 is an enlarged detail plan view with parts shown in horizontal section of the selector mechanism.

Fig. 3 is a plan view of some of the parts shown in Fig. 2, but with certain of the parts in shifted position.

Fig. 3a is a detail view of parts shown in Figs. 2 and 3.

Fig. 4 is a side elevation of parts shown in Fig. 1.

Fig. 5 is an enlarged detail view of parts shown in section on line 5 5 of Fig. 1.

Fig. 6 is a detail view of the parts shown in section on the line 6 6 of F ig. 5.

Fig. 7 is a view illustrating the application of the improved locking device to the selector mechanism shown in the prior Kleinschmidt application, Serial No. 704,022, parts being shown in elevation and parts in section on the line 7 7 of Fig. 8.

Fig. 8 is a cross section on the line 8 8 of Fig 7.

Like that shown in the Morton and Kruin application, Serial No. 757,661, the construction shown in Figs. 1 to 6 inclusive, comprises a base 10 and uprights or brackets 11 mounted thereon. The selector mechanism comprises a set of selectors in the form of thin, llat fingers 12 arranged one above the other between guide plates 13. These plates are mounted 0n studs 14 and are spaced by washers 15, and the studs are lixed to a plate 16 on the upper end of a bracket 11. The circular rear ends of the lingers engage corresponding seats of a series of live thin, flat bell cranks 17 disposed between the guide plates 13 and pivoted on a stud 18. Springs 19 normally hold the bell cranks and selector lingers in the position shown in Figs. 1 and 2, with the pointed rear ends of the bell crank arms adjacent the cam member 2O on the upper end of a shaft 21. The latter is continuously driven when the apparatus is in operation, being connected by suitable gearing (not shown) to the shaft of a small electric motor 24.

The cam member 20 has a spirally arranged series of teeth or cams 25, one for each of the levers 17 and which successively oscillate the levers and longitudinally reciprocate the selecting lingers 12 as the cam member is rotated. In addition to the longitudinal movement, the selectors or lingers 12 have a lateral swinging movement between a pair of stop pins 26 lixed to the plate 16 and project upwardly through slots in the guide plates 13. The setting of the selector lingers either in their right hand or left hand positions is controlled or determined by an electro-magnet 27 which is mounted on a bracket 27 a, the

bracket in turn being adjustably lixed to the plate 16 by screws 276. A magnet armature 28 is lixed to a lever 29. The latter is U- shaped in form at its end adjacent the magnet and is connected at this end by pivot studs 30 to a bracket 31. The latter is liXed to the plate 16 by two screws 32 and 33, the arrangement being sueh that the bracket can be adjusted about the screw as a pivot. A spring 3l extending between the armature and an adjusting screw tends to move the armature into engagement with an adjustable stop 36 (see Figs. 1 and el). But normally the magnet 27 is energized and holds the armature against the head of an adjustable stop screw 37. The stop screws 36 and 37 are mounted, as shown, upon the adjustable bracket 31. rl`he free end of the lever 29 is T-shaped and is provided with a pair of spaced downwardly extending arms 38 and these arms or abutments cooperate withlaterally projecting arms 39 on the rear ends of the selecting lingers 12 to position the latter either in their right or left-hand positions.

As in the prior selector mechanism referred to, the lingers 12 act through a series of shaped levers L10 to position a second set of selecting members or notched permutation bars 41. The T-levers are arranged between the guide plates 13 and are pivotally mounted on a stud l2. The permutation bars are segmental in form and are mounted upon guide studs 43 (only one of which is shown) fixed to the segmental support est. 'l`he permutation bars selectively control a plurality of actuating bars 115 which in turn eli'ect the operation of a series of type bars Li6. The springs 19 normally hold the selecting lingers 12 in their forward positions and in engagement with the T-levers 40, and the permutation bars al are thereby each held in one or the other of its two positions according as the corresponding selecting linger is in its right or left-hand position.

The abutments 38 on the end of the armature lever 29 are disposed in the rear of the rearwardly turned ends of the arms 39 of the selecting levers, but are spaced somewhat closer together than the ends of these arms, so that as the armature lever vibrates in response to the received electrical conditions, the parts 38 alternately move into and out of alignment with the ends of the arms 39, and will co-operate therewith as the lingers are reciprocated by the rotary cam member, to determine the setting of the lingers or selectors, each either in its right-hand or left-hand position. Thus, if the linger is in its righthand position as shown in Figs. 2 and 3, and the magnet 27 is energized at the time the linger is retracted by the rotary cam member, its right-hand arm 39 will engage the righthand abutment 38 of the armature lever and will thereby be shifted to its left-hand position, as indicated in dotted lines in Fig. 1. The selecting finger will remain in its lefthand position until the selector magnet is deenergized at the time the finger is retracted when the left-hand abutment and arm will cooperate to swing the finger to its right-hand position. When the setting of any selector finger is thus changed, it will, during the final portion of its forward movement, change the position of the corresponding permutation bar 41 by tilting the intermediate T-lever 40.

As explained in the above noted prior application, the tWo sets of selectors, the fingers 12 and the permutation bars 41, correspond in number, five in the present case, to the number of selecting intervals or units of the code combinations or signals. As each signal is received, the magnet 27 responds to the two different electrical conditions of the signals and selectively vibrates the armature lever 29 as the fingers are successively retracted by the spiral series of cams 25 and brought into cooperative relation with the lugs or abutments 38 of the armature lever during the corresponding selecting intervals of the signals, to thereby set the fingers in diHerent combinations. As stated, during the final forward movements of the selecting fingers effected by the springs 19, the setting of the fingers is transferred to the permutation bars. But if the latterl are locked by the printing of the previously selected character, the transfer is delayed until such printing operation is completed and the permutation bars unlocked.

To provide a wide margin of operation, the setting of the primary selectors or fingers 12 should be selected or determined at definite points or very brief intervals uniformly spaced throughout the selecting cycle, so that such points may register with the midportions of the intervals of the received signals or code combinations. Itis difficult, however, to so construct the parts of a mechanical selector so as to effect such an operation and particularly Where, as is highly desirable in order to permit rapid operation, the parts are of light weight and the vibratory movement of the armature lever slight. To provide for a wide margin, means is employed for intermittently locking the vibrating armature lever 39 in one or vthe other of its selecting positions, such locking occurring at definitely spaced points in the selecting cycle and which points are slightly in advance of the time intervals or portions of the cycle during which the setting of the -selectors or fingers 12 is effected.

In the preferred form shown, the locking device comprises an arm or lever 47 pivoted on one of the studs 18 and arranged between the two uppermost guide plates 13. The arm or lever 47 is provided with a nose or shoulder 48 and a spring 49 connected to the arm holds the nose 48 in engagement with the periphery of a cam 50 that forms part of and rotates With the cam member 20. This cam is provided With a circular series of teeth or shoulders 51, five in number, Which successively vibrate the arm during each operating cycle. The end of the arm is also provided with a beveled locking dog or knife-edge 52 which co-operates with a knife-edge 53 fixed to the under side of the armature lever adjacent its outer end. Vhen the nose 48 of the locking arm 47 is on the high portions of the cam 50, the knife-edge 52 is slightly out of the path of movement of the co-operating knife-edge 53 on the vibrating armature lever, but when the nose passes over the radial shoulders of the teeth 51, knife-edge 52 will engage knifeedge 53 and hold the armature lever either in its right-hand or left-hand position.

The number of teeth 51 corresponds to the number of selecting intervals of each signal and they are so spaced that the locking device is quickly shifted into engagement with the armature by the spring 49 at definite points in each revolution or setting cycle of the cam member 20, and which points are so arranged that the armature lever is locked in one or the other of its positions just before any engagement of the cams 39 with the abutments 38 occurs, so that the setting of the respective selectors is definitely determined at such points or brief intervals. liurthermore, the teeth 51 are so arranged that the armature lever is held against vibration while the arms 39 of th-e selecting fingers are in engagement with the abutments 38, and in this way the armature lever is securely held against vibration during any of the changes in the setting of the selectors.

By accurately constructing and adjusting the locking device and its operating cam, the other parts need not be as carefully and accurately constructed and adjusted and can bc light and small so as to be capable of high speed operation. To effect the adjustment of the locking device, the wedge or knifeedge 53 is provided with a rectangular stem portion 54 which fits within an elongated slot 55 (see Fig 3a) in the armature lever to per-- mit the adjustment of the knife-edge or Wedge 53 to and from the knife-edge 52, wedge 53 being secured in adjusted position by a nut 56 threaded on a reduced extension of its stem. The position of the Wedge 53 and abutments 38 on the armature lever relative to the locking dog 52 and the arms 39 of the selecting fingers, can be adjusted by adjustably shifting the bracket 31 on which the armature lever is mounted about the screw 32 as a pivot. As described, the bracket is held in adjusted position by the screw 32 and the screvs7 33, the latter passing through a slot in the bracket that is concentric with the screW 32. In practice, the application of the improved locking device to this selector mechanism has been found to give as wide a margin of operation as can be obtained with a selector having an electrical distributor or sunflower.

Figs. 7 and S illustrate the application of the improved locking device to the type of selector mec ianisin shown in the above noted Kleinschmidt application, Serial llo. 704,022. In that selector mechanism, the notched permutation bars GO which select and control the operation of a set of type actuating bars 61, are in turn controlled b v a set of pivoted selecting fingers G2. rldhe latter are pivotally mounted at their lower ends upon a stud 63 fixed to a bracket 64e and springs G5 tend to hold the upper ends of the levers (which are relatively offset as shown in Fig. 8) against a stepped stop plate 6G and in line with lugs GT on the corresponding permutation bars. The primary selectors or levers G2 are set er shifted from normal position by a spiral series of cam or pins 68 mounted on a shaft or barrel 69. The la ter is rotated during each operation by a continuously driven motor shaft 70 which is connected to a. short shaft 7l by a friction clutch T2. Shaft 7l has a forked extension 73 which is engaged by a pin 74: on the end of the shaft or barrel (if). A reduced extension 75 on the latter extends within the bore of the shaft 7l and a spring 7G coiled about this extension tends to shift the pin barrel to the left, and forces a reduced extension 7.7 on its other end (which is journaled in the bracket (Si) against the armature lever 7S of the magnet 79. A spring S0 tends to hold the armature lever in engagement with a stop screw 8l, but the magnet is normally energized and holds the armature lever against a stop screw 82 and the barrel or cam shaft in its right-hand position.

ln its normal right-hand position, the pins or cams (3S are in alignn'ient with the primar);v selectors or fingers G2, but when the magnet is deenergized and the cam shaft shifted to the left by spring 7G, these pins are out of alignment with the corresponding levers. llilhen in alignment therewith and rotated past lugs S3 on the corresponding fingers, the latter will be shifted to the left (when viewed as in Fig. S) to move their upper ends out of line with the lugs GT of the corresponding permutation bars, and any selected lever will be held in shifted position by the engagement of a latch S-f with shoulder S-l on the lever.

Normally, as stated` the magnet is energized and in this position a stop pin engages a stop lug SG on the bracket. lt is noted that the latches Si are wide enough that all of them except that corresponding to the first selector or finger. is adapted to be engaged by the corresponding pin or cani 68 whether the cam shaft is in its right-hand or left-hand position. The latch of the first Lacasse selecting linger is in the path of movement of the stop pin 85.

During the starting interval or unit of each signal, magnet 79 is deenergized and the shifting of the cam shaft 69 to the left disengages the stop pin 85 from the lug 86 so that the rotation of the cam shaft is initiated., During the remainder of the starting interval, the stop pin will engage and release the first latch 84rso that the first selecting lever is restored if it has been shifted during the previous selection. Thereafter the latches 84 are successively released and the cam shaft during its rotation is also vibrated by the armature lever i8 in response to the different electrical conditions extending through the selecting intervals or units of the signal. If the magnet is energized and the cam shaft in right-hand position as one of the pins or cams passes into operative relation with the li 83 on the corresponding selectors, the latter will be shifted and held in shifted position by the latches 84; but if the magnet is deenergized at any such interval, the pin or cam will clear the bevel S3 of the corresponding selector and leave the latter in its normal position. At the end of any printing operation, as described in the Kleinschmidt application, the permutation bars 60 are restored and the setting of the primary selectors (i2 is transferred thereto.

To lock the cam shaft against vibrating movement at definite uniformly spaced points during each selecting cycle, a locking bell crank lever 87 is pivotally mounted upon a portion 88 of the frame and a spring 89 connected to the lever tends to hold a roller SO thereon in engagement with a cam disc 91 fixed to the cam shaft or pin barrel 69. The latter has a series of depressions into which the roller drops at uniformly spaced intervals during each rotation of the cam shaft, to bring a knife-edge 92 on the locking lever into engagement with a beveled edge disc 93 on the cam shaft. In this way the cam shaft is locked either in its right or left-hand position just before it passes through any of its operating positions and the armature lever 78 is thereby rendered ineffective during the setting of the selectors. As indicated, the roller 90 is of sufficient width to properly engage the cam dise 91 in either of the positions of the axially movable or vibratory cam shaft.

ln the form shown in Figs. l to G inclusive, the rotary cam is driven from the shaft 2l through the medium of a friction clutch comprising pairs of dises Q-'l and 95 having washers JG of friction material between them. The discs 95 are keyed to the end of a sleeve 97 loosely mounted on the shaft 2l and on which the several cams and the lock operating cam 50 are mounted. These cams are keyed to the sleeve and are spaced apart by intermediate washers 98. One of the discs 94 has a threaded stem which is screwed into the upper end of the shaft 21. The other disc 94 is keyed to the shaft to rotate therewith but is capable of longitudinal movement thereon. A spring 99 extending between this disc and an adjusting nut 100 on the shaft presses the discs of the friction clutch into engagement with the washers 96 thereof.

An arm 101 on the upper end of the sleeve 97 of the cam member 20 is provided with an upturned end which normally engages a lug 102 on the lower arm of a U-fshaped stop dog 103. The latter is mounted upon a pivot stud 104 and its upper arm is arranged to be engaged by a latch 105. The latter is pivoted to a U-shaped hanger 106 and this hanger and the stud 104 are xed to an adjusting plate 107. The lat-ter is adjustably clamped by a pivot stud 108 to a plate 109 and the latter is fixed to two studs 110 that extend upwardly from the plate 16.

A spring 111 connected to the stop dog 103 tends to swing the latter in right-hand direction and move its upper arm into engagement with anadjustable eccentric stop 112 on the adjustable arm or plate 107. The adjusting stud 108, as most clearly shown in Fig. 5, and the inner end or arm of the latch 105 are in axial alignment with the shaft 21. A spring` 113 normally holds the outer end of the catch 105 depressed and in position to engage the upper arm of the stop dog 103. A trip in the form of a small bell crank 114 is pivotally mounted in a bracket 115 fixed to the under side of the plate 109 and its rounded inner end engages the adjacent end of the latch 105 at a point in axial alignment with the shaft 21 and the adjusting stud 108. A plunger 116 extending through the bracket 115 is adapted to be engaged by the eccentric head 117 of a screw or stud 118 on the upper short arm 119 of the armature lever 29. The head 117 is eccentrically mounted on the stud 118 so that its position can be adjusted.

During the first selecting interval, the magnet 27 is deenergized and the movement of the armature effected by the spring 34 will shift the plunger 116 and trip 114 and thereby disengage the latch 105 from the stop dog 103. The latter is then swung in counterclockwise direction by the pressure of the arm 101 against it and the movement and the cycle of operation of the rotary cam member is initiated. As soon as the arm 101 passes the shoulder 102, the stop dog is returned to normal position by its spring 111 and is again engaged by the latch 105. The parts are such that the cam member is positively arrested by the dog 103 at the end of each operation and is readily released or initiated in operation by a slight movement of the armature lever. Also, the tripping arrangement permits the orienta-tion adjustment of the stop 102, and or" the cam or distributing member and the two sets of cams 25 and 51 thereon so that the distributing member will pass through its first operating position during the mid-portion of the first selecting intervals of the received signals.

The locking device controlled by the circular series of cams or teeth 51 will insure that the selection or setting of the primary selectors is determined at definite spaced points in the setting cycle and which points will register with the mid-portions of the selecting intervals of the signals, although the actual operation of setting the selectors will not occur until slightly after such points have been reached. It is noted that the locking device is spring actuated to operative position and is withdrawn from operative position by the lock controlling cam and this arrangement prevents the jamming of the co-operating knife edges.

The improved locking means for single magnet mechanical selectors can be widely varied and applied to different forms, and changes may be made in the details set forth without departure from the scope of the appended claims.

I' claim as my invention:

1. In an electric selecting mechanism, a set of selectors adapted to be conditioned in different combinations, a member common to all of said selectors and electro-magnetically vibrated in response to received signals to control the settingof the selectors, and intermittently acting locking means for holding said member against vibratory movement at definitely spaced intervals during the setting cycle.

2. In an electric selecting mechanism, a set of selectors adapted to be conditioned in different combinations, an electro-magnet responsive to received code combinations of electrical conditions, a member vibrated by said magnet to determine the setting of said selectors, and intermittently acting, knife-edge locking means for said vibrating member adapted to be locally actuated in timed relation with the received code combinations to determine the setting of said selectors at definitely spaced points in the setting cycle.

3. In an electric selecting mechanism, a set of selectors, means for setting said selectors in different combinations including a locally driven member and a member electromagnetically vibrated in response to received signals to selectively control the setting of said selectors, and locking means timed in operation by said locally driven member for holding said electro-magnetically vibrated member in one or the other of its selecting conditions during the intervals in which the setting of the selectors is effective.

4. In an electric selecting mechanism, a set of selectors, means for setting said selectors in diiferent combinations including alocally driven member and a member electroinagiietieally vibrated in response to received signals to selectively control the setting of said selectors, and intermittently acting locking means including co-operating knife edges for holding said controlling member against vibratory movement, said locking means being timed in operation by said locally driven member to effect the engagement of the knife edges thereotl at definitely spaced points in the setting cycle and slightly in advance of the intervals in which the setting of said selectors is effected.

5. ln an electric selecting mechanism, a set off selectors, a member electro-magnetically vibrated in response to received signals to control the setting of said selectors in different combinations, and locking means movable only in a direction substantially at right angles to the direction of movement of the vibratory member for holding the said member against vibration during the setting of the selectors, said locking means and said member having co-operating knife edges.

In an electric selecting mechanism, a member vibrated in response to received signals, a locally actuated member, a set of selectors adapted to be set in different combinations under the joint control of said members, and locally actuated locking means other than the selectors for momentarily holding the first mentioned member against vibratory movement during the intervals in Which the setting of said selectors is effected.

7. In an electric selecting mechanism, a set of' selectors, an electro-magnet responsive to received code combinations of electric conditions, a member vibrated by said magnet, a locally actuated rotary member, said members (1o-operating to mechanically condition said selectors in different combinations, and a locking device timed in operation by the rotary member for holding the other of said members againstvibration during the time intervals in which the selective conditioning of each of the selectors is effected.

8. In an electric selecting mechanism, a set of selectors, an electro-inagnet responsive to received signals, a locally driven rotary member, a cani having a spirally arranged series of operatingportions actuated by said rotary member and co-operative with the armature of said magnet to mechanically condition said selectors in different combinations, a locking device 'for rendering the vibratory movement of the armature of said magnet ineffective, and a cam actuated by said rotary member and having a circular series of operatiiig portions for placing said locking device in operative position during the intervals in which the setting of the selectors is effected.

9. In an electric selecting mechanism, a set of selectors, a magnet responsive to received code combinations of' electrical conditions, a

locally driven rotary member co-operating mechanically With the armature of said magnet for setting said selectors in different combinations, and a knife edge locking device vibrated by said rotary member for holding the armature of the magnetagainst vibration during the intervals in which the setting ot the selectors is efi'ected.

l0. ln an electric selecting mechanism, a set of selectors cach adapted to be placed in either of tivo conditions, a magnet responsive to received code combinations of electrical conditions, a locally driven rotary member, a spirally arranged series of cams actuated by said rotary member for associating said selectors in order with the armature of said magnet to mechanically and selectively change the setting of the selectors, and a locking device actuated by said rotary member for holding the arinatuie against vibration during the time intervals in which the selective setting of the selectors is effected.

1l. In an electric selecting mechanism, a set or selectors each adapted to be placed in either of tivo conditions, a magnet responsive to received code combinations of electrical conditions, a locally driven rotary member, a spirally arranged series of cams actuated by said rotary member for associating said selectors in order vvith the arinatnre of said magnet to mechanically and selectively change the setting of said selectors, a corresponding circular series of cams actuated by said rotary member, and a lfnife edge locking` device vibrated by said circular series of cams for holding the armature of said magnet against vibration as each of the selectors is associated therewith.

l2. In an electric selective mechanism, a set of selectors, a controlling member vibrated in response to received signals, a locally driven, rotary member, means mech anically controlled by said members fior setting said selectors in different combinations, and a vibratory, knife-edge, locking device for holding said controlling member against vibratory movement, an actuating spring for shitting said locking device to operative position, and a timing cam actuated by said locally driven member for permitting the operation of said locking device at definitely spaced points in the setting cycle.

13. ln an electric selecting mechanism. a set of selectors, a rotary distributing member iaving two sets of cams, a magnet responsive to received signals and cti-operating with one setot cams to position said selectors in different combinations, and a locking device intermittently actuated by the other set of cams and co-operating with said niaguet to determine the setting of said selectors at definitely spaced points in the setting cycle and slightly in advance of the intervals in which the setting of' said selectors is effected.

14. In an electric selecting mechanism, a

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set of selectors, a magnet responsive to received signals, a rotary distributing member having tivo sets of cams, one set co-acting with the armature of said magnet to set said selectors in different combinations, a locking device timed in operation by the other set of cams for rendering the vibratory movements ofthe magnet armature ineffective during the intervals in which the setting of the selectors is effected, and a stop device adjustable about the axis of said distributing cam member for arresting the same at the end of each setting cycle.

15. In an electric selecting mechanism, a set of selecting fingers, a series of levers to Which said fingers are pivoted, the fingers having spaced arms adjacent their pivoted ends, a distributor cam for co-operating With said levers to successivley reciprocate said selecting fingers, a magnet responsive to received signals, an armature lever operated thereby and having spaced abutments at its free end movable alternately into and out of the paths of movement of the arms of said fingers to selectively swing the same to either' one of tivo positions, and a locking device for said armature lever intermittently actuated by said distributor cam, said locking device and armature having co-operating knife edges, one of which is adjustable.

16. In an electric selecting mechanism, a set of selecting lingers, a series or" levers to which said fingers are pivoted, the ngers having spaced arms adjacent their pivoted ends, a distributor cam for co-operating With said levers to successively reciprocate said selecting fingers, a magnet responsive to received signals, an armature lever operated thereby and having spaced abutments at its free end movable alternately into and out of the paths of movement of the arms of said fingers to selectively swing the same to either one of two positions, an adjustable support ivhereon said armature lever is pivoted, and adjustable stops on said support for limiting the movement of said lever.

17. In an electric selecting mechanism, a set of selecting fingers, a series of levers to which said fingers are pivoted, the fingers having spaced arms adjacent their pivoted ends, a distributor cam for co-operating With said levers to successively reciprocate said selecting fingers, a magnet responsive to received signals, an armature lever operated thereby and having spaced abutments at its Jfree end movable alternately into and out of the paths of movement of the arms of said fingers to selectively swing the same to either one of tivo positions, an adjustable support Whereon said armature is pivote-fl, and an adjustable bracket Whereon said magnet is mounted.

18. In an electric selecting mechanism. a set of selectors, an electromagnet and a rotary cam member cooperating With the armature of said magnet to set said selectors in different combinations, a motor actuated friction clutch for rotating said cam, a stop dog for arresting said cam, a latch for holding said dog in operative position, a support adjustable on an axis in line with the axis of said cam Whereon said stop dog and latch are mounted, and a pivoted trip lever actuated by the armature of said magnet and engaging said latch at a part in line With the axis of said cam.

19. In a selecting mechanism for printing telegraph receivers, a set of permutation selectors, an electro-magnet responsive to received code combinations of electrical conditions, an armature vibrated by said magnet,

a locally driven rotary member cooperating/f' with the armature of said magnet for mechanically setting said selectors in different combinations, and a locking device vibrated by said rotary member for rendering the vibratory movements of the magnet armature ineffective during` the intervals in which the setting of the selectors is effected.

20. In a selector mechanism for telegraph receivers, the combination of a set of selectors adapted to be conditioned in different combinations, a single magnet responsive to received signals, a member vibrated by said magnet and mechanically controlling the setting of said selectors and means independent of the selectors for holding said member against vibratory movement at definitely spaced points in the setting cycle and during the intervals in which the member is effective to control the setting of the selectors.

Q1. In a receiver for telegraph systems, the combination With a set of selectors adapted to be conditioned in diderent combinations, of a single selecting magnet, a member vibrated thereby in response to received signals and effective to mechanically determine the conditioning of said selectors and a vibratory locking device locally actuated and timed in operation and movable in a direction substantially at right angles to the direction of movement of the vibratory member for holding the latter against vibration at definite spaced points in the setting cycle and during the intervals in Which the setting of the selectors is effected.

22. In a receiver for telegraph systems, a set of selectors, a controlling member vibrated in response to received signals, a locally driven member, said member cooperating to mechanically effect the setting of said selectors in different combinations, a virbratory locking device for holding said controlling member against movement, an actuating spring for shifting said locking device to operating position and timing means actuated by said locally driven member for permitting the operation of said locking device during the intervals in which the setting of the selectors is effected.

HOWARD L. KRUM. 

